Custom software development in Bastia, Corsica
Our custom software development starts from the way you work, not from a catalogue. We write business software, subscription platforms, connectors or small extensions for SMEs and startups as well as public bodies in Corsica. We publish software of our own too, so we know delivery is only the beginning. What we build, we also host and maintain.
What we do
- 01
Custom business software
A tool shaped around how you already do things, for tracking cases or planning who goes where tomorrow. It replaces the pile of spreadsheets nobody dares touch any more. The software adjusts to you, for once.
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SaaS platforms
SaaS is software your customers use online on a subscription, with nothing to install. We build it from a first version tried by a handful of real users through to a platform that runs every day.
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APIs and integrations
An API lets two programs swap data without anyone copying it across. We might link an online shop to the accounts, so an order is never typed twice.
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Plugins and digital resources
An extension adds the missing feature to software you already use. We also produce ready-made templates and resources, for your own staff or to sell.
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Maintenance and improvements
Once it is live, the software stays under our watch. We host it and apply the security fixes. We repair what breaks. New features arrive when your business needs them.
Our solutions in detail
Custom business software
What changes day to day with a tool built around your procedures, how we develop it, and what pushes its price up or down.
LEARN MORESaaS development
Going from an idea to subscription software. Why to start with an MVP, how to keep each customer's data apart, which billing model to pick.
LEARN MOREAPIs and integrations
Linking your software through APIs. Shop and accounts stay in sync, and the exchanges are encrypted and monitored.
LEARN MOREPlugins and extensions
Add the feature your tools lack, or sell your own extensions and templates. The uses, the method, and what needs checking.
LEARN MORE
A software publisher based in Bastia
KALLISTACK is a Bastia company founded by Alexandre Sciacca, a full-stack engineer with more than ten years behind him. We follow a piece of software for its whole life. It starts with design and a bit of research, moves through a prototype, then development and integration with your tools, and it carries on well after delivery with maintenance, then distribution or commercial operation. We build for clients. We also publish our own tools.
Wearing both hats matters to you directly. A publisher knows software does not stop on launch day; someone has to host it and watch it, fix what breaks and document what changes, sometimes for years. So we write every project as if we were the ones taking it over later. The code stays readable. It is tested, with no dark corners.
Our clients are SMEs and startups, and public bodies too, on the island and elsewhere. Every enquiry gets a reply within 48 hours. Our quotes are written to make sense to someone who has never opened a code editor.
Business software, SaaS, an API or just an extension?
At the start, the technical labels hardly matter. We begin with the problem. These are the situations we see most often.
- 01
Your business runs on spreadsheets
The schedule sits in one file, the case notes in another, everything else in email. Business software pulls it all into one place, and each person gets access that fits their role.
- 02
You want to sell a service online
What you know how to do can become software that other businesses pay for by subscription. That is what SaaS means. It nearly always starts with a first version cut down to the essentials.
- 03
Your software does not talk to each other
The online shop has no idea what is in the accounts, and the customer file lives a life of its own. API integrations move the data between them, with no copy and paste.
- 04
A tool you like is missing one feature
That is no reason to switch. A plugin adds exactly what is missing, and your staff keep their habits.
- 05
No development is needed
It happens. Sometimes an existing product does the job, as long as it is picked with care and properly configured. We will tell you, and we can help you choose.
A custom software development project, one stage at a time
The approach does not change with the size of the project. Each stage ends with your sign-off. We would rather ship an early first version built around the essentials, put it in front of your users, then grow it from what they tell us.
- 01
Understand
Your goals come first, then your organisation and the tools you already use. Budget and timing are on the table from this point.
- 02
Design
We put forward a reasoned solution with mock-ups of the screens. You approve them before a single line of code is written.
- 03
Build
Development moves forward in tested steps. You can see where things stand and try the software on a test version.
- 04
Launch and support
Go-live and hosting, maintenance, then improvements. We stay around.
What we build for ourselves
Our own products go through the same standards as yours. La Forge is a software factory driven by autonomous agents. It turns a stated requirement into tested, reviewed code, running several tasks side by side. Feature Workflow is a plugin for an AI coding agent. It makes the agent follow a structured sequence, from defining a feature through to tests and documentation.
Hameau Vivant is a persistent online simulation written in TypeScript (Node.js, SQLite, Three.js). The world keeps existing between visits, and events reach everyone connected in real time. Underneath, these are business software problems. Data that must never go missing, a service that cannot stop, automated checks, and code that must stay maintainable as it grows.
Sale, licence or subscription, decided early
If the software is meant to be sold, how you sell it gets settled early, because it changes the design. A sale grants the right to use it, once. A licence is permission to use the software under conditions (number of users, duration, whether updates are included). A subscription opens access for as long as it is paid for. Pay-per-use follows actual consumption.
Each model has technical consequences. You need accounts and permissions, sometimes an activation system, and always invoicing plus usage tracking. We help you settle on the model that suits your audience. Then we build it into the software, with a suitable payment provider.
Who this service is for
SMEs and startups, plus local authorities, in Corsica or on the mainland. You do not need to be technical. Tell us about your business and about whatever eats up your week; we come back with a proposal and a quote you can read in one sitting. You deal with the same person throughout.
How we work
- T-3
Understand
We talk through your goals and budget. You get a quote you can actually read.
- T-2
Design
We map out the solution and the mock-ups, which you approve before any development starts.
- T-1
Build
We develop and test. You follow progress at every step.
- T-0
Launch & support
Go-live. After that we host it, fix it and keep improving it.
Technologies and methods
- TypeScript
- Node.js
- React / Next.js
- REST APIs
- Docker
- Real time (SSE)
- Automated testing
Frequently asked questions
Why custom software rather than an off-the-shelf product?
Often you should buy. If a product on the market covers your needs, it will do the job well, and we will say so plainly. Building your own becomes worthwhile when you spend your days working around the tool or the subscriptions keep piling up, or when the way you work is precisely what sets you apart.
How much does custom software cost?
Mostly it comes down to how many features and users there are. After that come the links to your other tools and the data to bring across, then the support you want afterwards. After a first conversation you get a detailed quote in plain language, before you commit to anything.
Who owns the code and the data?
That is settled in the quote, before any development. It states who holds the source code and how it is handed over, where your data lives, and how to export it in a standard format. You know from the outset what is yours.
Can you take over existing software?
Yes, after a review. We read the code and look at the hosting and the documentation. Then we tell you what can stay, what needs fixing first, and whether it makes more sense to improve what is there or rebuild it.
Do you only work with businesses in Corsica?
No. We are happy to work with companies and local authorities on the island, and with clients elsewhere in France and beyond. Software builds perfectly well at a distance. Video calls, a test version online, progress tracked in a shared space.
Do I need a detailed specification to get started?
No. A conversation is enough to begin. You explain what you want to achieve, on what budget and by when. We then shape the requirements with you during the design stage. If you already have a specification, we start from it.
Do you build mobile apps as well?
Yes, web and mobile applications are part of the job. Depending on the use, a web app that installs on a phone may be enough. We will recommend whichever format suits your users best.